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As far as I can tell these two sticks are identical, except that one is listed specifically as an upgrade to the ibook, and the other is listed simply as a 200-pin 512 MB PC2100 SO-DIMM. Funny thing is the price is £25 less for the latter (i.e. the one that is not listed specifically for Apple)!

The only difference in the listings is the '64 Meg x 64' part. I hope that's not important .

Let us know how you got on...I'm looking to upgrade my ibook, and I'm guessing if theres £25 difference between the 256mb sticks, it will be the same or bigger difference between the 512mb sticks or even 1gb sticks !

I'm REALLY not sure, but the 64X64 listing might be the internal arrangement of the RAM block sizes. Serial and parallel accesses do make a difference, but that's something VERY itnernal to the RAM and I dont see why they would put info like that.

Hey, excellent discovery there! I was planning to get only 256MB because the 512MB is such a rip-off at 3x the price of a 256MB for just double the amount of memory! I hope that the cheaper one works for you and if so, then I'll place my order for a 512MB one straight away!

I contacted Crucial Customer Service yesterday with this question, and here is a transcript of my online conversation (it reads from the bottom up):

Jennie> You're welcome. Thank you for visiting Crucial.com, and have a
great day.
Doug> right. okay, thanks very much.
Jennie> Just in they way you selected they item you were searching for.
Doug> the more expensive one only comes up when using the memory finder
for an apple ibook G4.
Doug> heh. that's what i expected. any idea why they have two different
prices?
Jennie> They are the same. I would select the cheaper one of the.
Doug> right
Jennie> One moment, please, while I review your inquiry.
Doug> but one costs notably more than the other
Doug> all the specs appear identical
Doug> both are 512 MB PC 2100 200-pin SO-DIMMs
Doug> i'm just wondering what the difference is between these two items:
CT6464X265 and CT372707
Doug> hi there

Jennie> Hello Doug. How can I help you?

So there you have it. Both are the same, but Apple users who use the 'Memory Finder' and may not be tech savvy enough to search the regular listing (nobody here I'm sure ) get hosed.